Can certain types of traps attract unwanted species?

Unwanted Attractants

When building fish traps and weirs, funnel traps, rock weirs, and basket traps, it’s essential to consider the type of bait used and the trap’s design. For instance, a rock weir with a strong fish oil scent may attract not only the target species but also non-target fish like sturgeon and catfish. Research suggests that 70% of sturgeon species are attracted to strong fish oils and oils of fatty fish. A more selective bait like chum made from small fish like sardines can help minimize unwanted attractants.

Trap Design and Placement

The placement and design of the trap can also play a significant role in minimizing unwanted species. For example, placing a trap in a shallow area with a sandy or rocky bottom can help reduce the likelihood of attracting non-target species like crayfish and snails. Additionally, the use of a funnel trap with a narrow entrance can help prevent larger non-target species from entering the trap. By positioning the trap at the right depth and angle, you can also reduce the likelihood of attracting birds and other aerial predators.

Maintenance and Cleaning

Regular maintenance and cleaning of the trap are also crucial in minimizing unwanted species. After each use, the trap should be thoroughly cleaned, and any bait or residue removed. This will not only prevent the spread of disease but also reduce the attractiveness of the trap to non-target species. It’s recommended to clean the trap at least once a week, depending on the frequency of use. By taking these precautions, you can help ensure that your traps are effective and minimize the risk of attracting unwanted species.